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有,IEC60335-1 的29章里,根据CTI来划分材料等级的
/ b" t, f! i! U. r IEC60335-1:2001+A1:2004+A2:2006 4 P8 }# L/ z, I" e& ]" j( R' U8 O
The relationship between the material group and the comparative tracking index (CTI) values,
6 ]; p( J7 X. H* P- D3 ~& xas given in subclause 2.7.1.3 of IEC 60664-1, is as follows:
" \9 W2 R$ K6 X8 ~# d+ j– material group I: 600 ≤ CTI;
* v# K; R$ H% m' y* g– material group II: 400 ≤ CTI < 600;8 R& d j. M0 P7 V$ W' g0 q
– material group IIIa: 175 ≤ CTI < 400;
. G+ Z) d0 s; g% [, `2 I, _– material group IIIb: 100 ≤ CTI < 175, |
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